I figured out this shortcut as well:

Download firmware files
-----------------------------

https://github.com/OpenELEC/wlan-firmware/tree/master/firmware/b43/

    n0initvals16.fw
    n0bsinitvals16.fw
    ucode16_mimo.fw


Copy to dest
--------------

    sudo mkdir /lib/firmware/b43/
    sudo cp * /lib/firmware/b43/


Reload module
--------------------

sudo modprobe -r b43
sudo modprobe b43

Look in dmesg for info/errors.


Install proper package
---------------------------

    sudo apt-get install firmware-b43-installer

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-firmware in Ubuntu.
https://bugs.launchpad.net/bugs/2080179

Title:
  Broadcom wifi firmware

Status in linux-firmware package in Ubuntu:
  New

Bug description:
  Original:

  https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1881064

  In short, I installed 20.04 on an old repurposed iMac 9,1 with
  Broadcom 4322 wifi. Everything went well, but no network access. Dmesg
  said "firmware not found."

  I went thru a hell of a time to figure out what to do, find the
  firmware on another computer, and sneaker-net it over.

  ------------------------------------------------

  I recently repaved this machine with 24.04.  Same ordeal but I knew
  what to do this time:

  -
  
https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx#b43_-_No_Internet_access

  - https://askubuntu.com/questions/730799/installing-
  firmware-b43-installer-offline/730813#730813

  Please add this to the install disc somewhere if possible.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2080179/+subscriptions


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